Record Details

A novel technique for optimising harmonics and reactive power with load balancing under non-sinusoidal supply and unbalanced load conditions

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title A novel technique for optimising harmonics and reactive power with load balancing under non-sinusoidal supply and unbalanced load conditions
 
Creator GEORGE, S
AGARWAL, V
 
Subject power quality and harmonics
power factor compensation
active power filters
dsp control
 
Description Generally, conventional power factor corrections techniques assume ideal conditions, viz. sinusoidal supply voltage and balanced load. But vast majority of the domestic and industrial loads present in the power distribution system are non-linear and unbalanced. Under such conditions, attempt to make the power factor unity result into a non-sinusoidal source current, which increases total harmonic distortion (THD) in the system. On the other hand attempt to make harmonic free current may not result in unity power factor because of the harmonics present in the supply voltage. Thus, there is a trade off between improvement in power factor and reduction in THD. With the introduction of power quality norms by various utilities, it has become unavoidable to optimize power factor while satisfying harmonics limits. In this paper, a novel technique for optimisation of THD and power factor subject to power quality constraints is presented. The algorithm uses Lagrange multiplier technique to optimise the non-linear equations. The algorithm calculates the control coefficients by Newton Raphson method and is used to compute the desired source current that balances the system besides optimising power factor satisfying the load power while meeting the THD limits. Knowing the load current, the compensating current to be supplied by the shunt active power filter to the power system is calculated. This technique, besides satisfying the power quality norms, also balances the imbalance in the system. It is applicable for single-phase and multi-phase system under sinusoidal and non-sinusoidal supply conditions. The proposed scheme does not use the widely used p-q theory and use simple computational techniques. Simulation using MATLAB has shown encouraging results. The scheme is being implemented in hardware using DSP.
 
Publisher IEEE
 
Date 2011-10-25T09:23:21Z
2011-12-15T09:11:46Z
2011-10-25T09:23:21Z
2011-12-15T09:11:46Z
2003
 
Type Proceedings Paper
 
Identifier PESC'03: 2003 IEEE 34TH ANNUAL POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-4, CONFERENCE PROCEEDINGS,1537-1541
0-7803-7754-0
0275-9306
http://dspace.library.iitb.ac.in/xmlui/handle/10054/15673
http://hdl.handle.net/100/2275
 
Source 34th Annual IEEE Power Electronics Specialists Conference,ACAPULCO, MEXICO,JUN 15-19, 2003
 
Language English